Patents Assigned to International Synthetic Rubber Co., Ltd.
  • Separation of ethylbenzene from para- and meta-xylenes by extractive distillation
    Patent number: 4299668
    Abstract: Ethylbenzene and para-xylene and/or meta-xylene are difficult to separate by distillation because they boil only 2.3 C..degree. and 3.1 C..degree. apart. Ethylbenzene can be readily separated from the xylenes by using extractive distillation in which the extractive distillation agent is a mixture of pentachlorophenol admixed with certain chlorinated and/or oxygenated organic compounds boiling higher than the xylenes. A typical mixture comprises pentachlorophenol, benzene hexachloride and 1,2,4-trichlorobenzene.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: November 10, 1981
    Assignee: International Synthetic Rubber Co., Ltd.
    Inventor: Lloyd Berg
  • Separation of ethylbenzene from para- and meta-xylenes by extractive distillation
    Patent number: 4292142
    Abstract: Ethylbenzene and para-xylene and/or meta-xylene are difficult to separate by distillation because they boil only 2.3 C..degree. and 3.1 C..degree. apart. Ethylbenzene can be readily separated from the xylenes by using extractive distillation in which the extractive distillation agent is a mixture of oxygen-containing organic compounds boiling higher than the xylenes. The mixture typically includes phthalic anhydride and maleic anhydride with or without a solvent.
    Type: Grant
    Filed: January 12, 1981
    Date of Patent: September 29, 1981
    Assignee: International Synthetic Rubber Co., Ltd.
    Inventor: Lloyd Berg
  • Olefin polymerization
    Patent number: 4199473
    Abstract: A process for preparing a modified titanium chloride component for a titanium-containing Ziegler olefin polymerization catalyst comprising (1) treating an ether-free organo-magnesium compound with an oxygen-containing organic compound other than an ether, or with carbon dioxide or oxygen under anhydrous conditions and (2) reacting the product with titanium tetrachloride.
    Type: Grant
    Filed: December 13, 1977
    Date of Patent: April 22, 1980
    Assignee: The International Synthetic Rubber Co. Ltd.
    Inventor: Donald G. Timms
  • Thermosplastic elastomeric materials
    Patent number: 3935176
    Abstract: A thermoplastic elastomeric material comprising a hydrogenated copolymer of a conjugated diene characterised in that the copolymer before hydrogenation is a random copolymer of 70 to 99 mole % of at least one conjugated diene and 30 to 1 mole % of at least one vinyl aromatic compound, is of number average molecular weight of at least 100,000, and has a vinyl content of at most 40 mole % based on total monomers, and in that the copolymer is hydrogenated to an extent such that the mole percentage saturation is in the range 40 to 90%.
    Type: Grant
    Filed: September 8, 1971
    Date of Patent: January 27, 1976
    Assignee: The International Synthetic Rubber Co., Ltd.
    Inventors: John Richard Hawkins, John Michael Locke